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P17 gets XORed with

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in Cryptograph & Network Security by (60.1k points)
P17 gets XORed with

(a) K3

(b) K12

(c) K17

(d) K6

I have been asked this question in class test.

Question is taken from Blowfish Algorithm in division Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

1 Answer

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Best answer
Correct choice is (a) K3

Best explanation: XOR P1 with the key K1, XOR P2 with K2, and so on for all bits of the key (possibly up to P14). Repeatedly cycle through the key bits until the entire P-array has been XORed with key bits.

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